/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.util;

import proguard.util.*;

import java.io.PrintStream;
import java.util.List;

/**
 * This class prints out and counts warnings.
 *
 * @author Eric Lafortune
 */
public class WarningPrinter {
    private final PrintStream printStream;
    private final StringMatcher classFilter;
    private int warningCount;

    /**
     * Creates a new WarningPrinter that prints to the System.err print stream.
     */
    public WarningPrinter() {
        this(System.err);
    }

    /**
     * Creates a new WarningPrinter that prints to the given print stream.
     */
    public WarningPrinter(PrintStream printStream) {
        this.printStream = printStream;
        this.classFilter = null;
    }

    /**
     * Creates a new WarningPrinter that prints to the given print stream, except if the names of any involved classes
     * matches the given filter.
     */
    public WarningPrinter(PrintStream printStream, List classFilter) {
        this.printStream = printStream;
        this.classFilter = classFilter == null ? null : new ListParser(new ClassNameParser()).parse(classFilter);
    }

    /**
     * Prints out the given warning and increments the warning count, if the given class name passes the class name
     * filter.
     */
    public void print(String className, String warning) {
        if (accepts(className)) {
            print(warning);
        }
    }

    /**
     * Returns whether the given class name passes the class name filter.
     */
    public boolean accepts(String className) {
        return classFilter == null || !classFilter.matches(className);
    }

    /**
     * Prints out the given warning and increments the warning count, if the given class names pass the class name
     * filter.
     */
    public void print(String className1, String className2, String warning) {
        if (accepts(className1, className2)) {
            print(warning);
        }
    }

    /**
     * Returns whether the given class names pass the class name filter.
     */
    public boolean accepts(String className1, String className2) {
        return classFilter == null || !(classFilter.matches(className1) || classFilter.matches(className2));
    }

    /**
     * Prints out the given warning and increments the warning count.
     */
    private void print(String warning) {
        printStream.println(warning);

        warningCount++;
    }

    /**
     * Returns the number of warnings printed so far.
     */
    public int getWarningCount() {
        return warningCount;
    }
}
